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Claude Sonnet 5.5 vs GPT-5.4 Nano

Claude Sonnet 5.5 leads GPT-5.4 Nano on coding, 87.3 to 44.8 on the Vibe Coding Index, and GPT-5.4 Nano costs 8.0x less per output token ($1.25 vs $10.00 per million). Updated October 23, 2026; 57 benchmarks have a result for both.

Replace Claude Sonnet 5.5 Replace GPT-5.4 Nano
Claude Sonnet 5.5Anthropic
Coding
87.3
Overall
82.8
Output $/M
$10.00
57
GPT-5.4 NanoOpenAI
Coding
44.8
Overall
45.8
Output $/M
$1.25
0
vs boards won of 57 shared

Claude Sonnet 5.5 or GPT-5.4 Nano: which to pick

Pick Claude Sonnet 5.5 for coding: it scores 87.3 on the Vibe Coding Index against 44.8 for GPT-5.4 Nano.

Pick GPT-5.4 Nano for output tokens 8.0x cheaper ($1.25 vs $10.00 per million).

Model AClaude Sonnet 5.5Anthropic87.3/1005 independent benchmarksNo cost per solved taskModel BGPT-5.4 NanoOpenAI44.8/1002 independent benchmarks$0.14 per solved task
Shared results
57
Claude Sonnet 5.5 only
42
GPT-5.4 Nano only
28
Like-for-like categories
7 of 9

Only benchmarks that tested both models count toward a pick; a result only one model has is shown but not compared.

Which one for your work

Each card is decided by one number both models carry. Where only one has it, the card says so and makes no call.

At a glance

Coding index
Claude Sonnet 5.5 87.3 from 5 benchmarks, GPT-5.4 Nano 44.8 from 2 benchmarks.
Widest category
Math, 42.0 points apart on average over 6 shared benchmarks.
Widest single gap
ProofBench: Claude Sonnet 5.5 100.0% against GPT-5.4 Nano 5.0%, 95.0 points apart on a 0 to 100 scale.
Output price
Claude Sonnet 5.5 $10.00 against GPT-5.4 Nano $1.25 per million output tokens, 8.0x apart.
Context window
Claude Sonnet 5.5 takes 1M tokens, GPT-5.4 Nano 400K.

Benchmark by benchmark

First the score: boards each model leads, per category, where both have a result. Then every board, a category to a fold; bars are each result on a 0 to 100 scale, so compare the two in a row, not one row with another.

Boards won, where both have a result
CategoryClaude Sonnet 5.5BarsGPT-5.4 NanoTies
Coding70
Intelligence20
Agentic work40
Reasoning90
Math60
Knowledge60
General230
All shared boards570
CodingLike-for-likeSix of these boards feed the Vibe Coding Index70
Coding benchmarks for Claude Sonnet 5.5 and GPT-5.4 Nano
BenchmarkClaude Sonnet 5.5GPT-5.4 NanoLeader
LiveBench coding94.7%Not measuredOnly Claude Sonnet 5.5 measured
LMArena WebDev1767Not measuredOnly Claude Sonnet 5.5 measured
AA Coding IndexNot measured56.1Only GPT-5.4 Nano measured
LiveCodeBench (Vals AI)Not measured84.0%Only GPT-5.4 Nano measured
SWE-bench Verified (Vals AI)Not measured69.8%Only GPT-5.4 Nano measured
Terminal-Bench 4 (Vals AI)64.1%Not measuredOnly Claude Sonnet 5.5 measured
Vibe Code Bench (Vals AI)92.4%26.1%Claude Sonnet 5.5
Code migration (Vals AI)69.8%14.5%Claude Sonnet 5.5
ProgramBench (Vals AI)6.5%Not measuredOnly Claude Sonnet 5.5 measured
IOI (Vals AI)83.1%Not measuredOnly Claude Sonnet 5.5 measured
Terminal-Bench 2.1 (Vals AI)83.2%41.6%Claude Sonnet 5.5
SWE-bench Multimodal (Vals AI)58.3%Not measuredOnly Claude Sonnet 5.5 measured
CyberBench (Vals AI)59.6%Not measuredOnly Claude Sonnet 5.5 measured
SciCode61.0%47.2%Claude Sonnet 5.5
Terminal-Bench Hard (Artificial Analysis run)Not measured42.4%Only GPT-5.4 Nano measured
FrontierCode52.1%Not measuredOnly Claude Sonnet 5.5 measured
FrontierSWE61.9%Not measuredOnly Claude Sonnet 5.5 measured
WeirdMLNot measured49.2%Only GPT-5.4 Nano measured
ALE-Bench1819.11004.5Claude Sonnet 5.5
LMArena Text: coding15101405Claude Sonnet 5.5
LMArena Text: software and IT15011403Claude Sonnet 5.5
LMArena WebDev: React1815Not measuredOnly Claude Sonnet 5.5 measured
LMArena WebDev: HTML1738Not measuredOnly Claude Sonnet 5.5 measured
LMArena WebDev: from an image1737Not measuredOnly Claude Sonnet 5.5 measured
SciCode13.8%Not measuredOnly Claude Sonnet 5.5 measured
SWE-Bench Pro V295.8%Not measuredOnly Claude Sonnet 5.5 measured
Neither model has a result on the other 17 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for Claude Sonnet 5.5 and GPT-5.4 Nano
BenchmarkClaude Sonnet 5.5GPT-5.4 NanoLeader
AA Intelligence Index56.020.7Claude Sonnet 5.5
Epoch Capabilities Index166.2146.0Claude Sonnet 5.5
Agentic workLike-for-likePublic boards, shown as published, kept out of the index40
Agentic work benchmarks for Claude Sonnet 5.5 and GPT-5.4 Nano
BenchmarkClaude Sonnet 5.5GPT-5.4 NanoLeader
AA Agentic IndexNot measured16.0Only GPT-5.4 Nano measured
Design Arena: agents building web apps1305Not measuredOnly Claude Sonnet 5.5 measured
Design Arena: agents building mobile apps1262Not measuredOnly Claude Sonnet 5.5 measured
Design Arena: spreadsheets1272Not measuredOnly Claude Sonnet 5.5 measured
LiveBench research83.6%Not measuredOnly Claude Sonnet 5.5 measured
LiveBench browser84.0%Not measuredOnly Claude Sonnet 5.5 measured
LiveBench long agentic78.8%Not measuredOnly Claude Sonnet 5.5 measured
SREBench (Vals AI)30.1%Not measuredOnly Claude Sonnet 5.5 measured
Finance Agent (Vals AI)58.1%38.2%Claude Sonnet 5.5
Tax Agent Bench (Vals AI)42.0%5.0%Claude Sonnet 5.5
Legal Research Bench (Vals AI)48.1%6.3%Claude Sonnet 5.5
Harvey's Legal Agent Benchmark (Vals AI)10.4%Not measuredOnly Claude Sonnet 5.5 measured
Excel Modeling Benchmark (Vals AI)75.7%44.8%Claude Sonnet 5.5
BioMysteryBench (Vals AI)81.1%Not measuredOnly Claude Sonnet 5.5 measured
Terminal-Bench-Science (Vals AI)47.1%Not measuredOnly Claude Sonnet 5.5 measured
Vals Science Index59.1%Not measuredOnly Claude Sonnet 5.5 measured
τ²-Bench TelecomNot measured76.0%Only GPT-5.4 Nano measured
APEX-Agents75.5%Not measuredOnly Claude Sonnet 5.5 measured
SpireClimb1.3%Not measuredOnly Claude Sonnet 5.5 measured
Vending-Bench 2$11,165Not measuredOnly Claude Sonnet 5.5 measured
Neither model has a result on the other 22 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index90
Reasoning benchmarks for Claude Sonnet 5.5 and GPT-5.4 Nano
BenchmarkClaude Sonnet 5.5GPT-5.4 NanoLeader
GPQA DiamondNot measured77.5%Only GPT-5.4 Nano measured
LiveBench reasoning91.6%Not measuredOnly Claude Sonnet 5.5 measured
MysteryMechanism (Vals AI)49.1%Not measuredOnly Claude Sonnet 5.5 measured
MMMU Pro (Vals AI)Not measured73.6%Only GPT-5.4 Nano measured
GPQA Diamond (Artificial Analysis run)Not measured81.7%Only GPT-5.4 Nano measured
Humanity's Last Exam (Artificial Analysis run)55.0%28.3%Claude Sonnet 5.5
GPQA Diamond (Epoch AI run)95.6%78.5%Claude Sonnet 5.5
ARC-AGINot measured51.5%Only GPT-5.4 Nano measured
ARC-AGI-2Not measured5.7%Only GPT-5.4 Nano measured
Chess puzzles59.0%45.0%Claude Sonnet 5.5
Mystery game puzzles65.0%9.0%Claude Sonnet 5.5
LMArena Text: hard prompts14931381Claude Sonnet 5.5
LMArena Text: expert15301396Claude Sonnet 5.5
LMArena Text: hard prompts in English15021387Claude Sonnet 5.5
LMArena Vision: diagrams13291210Claude Sonnet 5.5
LMArena Vision: homework13311225Claude Sonnet 5.5
Kagi LLM BenchmarkNot measured39.7%Only GPT-5.4 Nano measured
Humanity's Last Exam (Scale run)37.5%Not measuredOnly Claude Sonnet 5.5 measured
Neither model has a result on the other 5 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index60
Math benchmarks for Claude Sonnet 5.5 and GPT-5.4 Nano
BenchmarkClaude Sonnet 5.5GPT-5.4 NanoLeader
AIMENot measured88.8%Only GPT-5.4 Nano measured
OTIS Mock AIME100.0%87.8%Claude Sonnet 5.5
FrontierMath, tiers 1 to 388.8%44.9%Claude Sonnet 5.5
FrontierMath, tier 480.5%12.2%Claude Sonnet 5.5
ProofBench100.0%5.0%Claude Sonnet 5.5
LMArena Text: math14981406Claude Sonnet 5.5
LMArena Text: mathematical work15111409Claude Sonnet 5.5
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index60
Knowledge benchmarks for Claude Sonnet 5.5 and GPT-5.4 Nano
BenchmarkClaude Sonnet 5.5GPT-5.4 NanoLeader
MMLU ProNot measured77.2%Only GPT-5.4 Nano measured
LegalBench (Vals AI)Not measured77.9%Only GPT-5.4 Nano measured
CaseLaw (Vals AI)Not measured51.9%Only GPT-5.4 Nano measured
CorpFin (Vals AI)Not measured61.2%Only GPT-5.4 Nano measured
TaxEval (Vals AI)Not measured67.4%Only GPT-5.4 Nano measured
MortgageTax (Vals AI)Not measured59.1%Only GPT-5.4 Nano measured
MedCode (Vals AI)52.9%41.0%Claude Sonnet 5.5
SimpleQA Verified46.5%11.7%Claude Sonnet 5.5
LMArena Text: science14861374Claude Sonnet 5.5
LMArena Text: medicine and healthcare14671369Claude Sonnet 5.5
LMArena Text: legal and government14801368Claude Sonnet 5.5
LMArena Text: business and finance14681366Claude Sonnet 5.5
Neither model has a result on the other 8 boards here
Web designDirectional onlyPublic boards, shown as published, kept out of the index7 boards, none shared
Web design benchmarks for Claude Sonnet 5.5 and GPT-5.4 Nano
BenchmarkClaude Sonnet 5.5GPT-5.4 NanoLeader
Design Arena: websites1327Not measuredOnly Claude Sonnet 5.5 measured
Design Arena: UI components1369Not measuredOnly Claude Sonnet 5.5 measured
Design Arena: game dev1470Not measuredOnly Claude Sonnet 5.5 measured
Design Arena: data viz1382Not measuredOnly Claude Sonnet 5.5 measured
Design Arena: 3D1400Not measuredOnly Claude Sonnet 5.5 measured
Design Arena: all code categories1357Not measuredOnly Claude Sonnet 5.5 measured
LiveBench design85.0%Not measuredOnly Claude Sonnet 5.5 measured
Neither model has a result on the other 2 boards here
GeneralLike-for-likePublic boards, shown as published, kept out of the index230
General benchmarks for Claude Sonnet 5.5 and GPT-5.4 Nano
BenchmarkClaude Sonnet 5.5GPT-5.4 NanoLeader
Vals Index70.8%Not measuredOnly Claude Sonnet 5.5 measured
LiveBench data analysis59.5%Not measuredOnly Claude Sonnet 5.5 measured
Public Benefits Bench (Vals AI)67.2%Not measuredOnly Claude Sonnet 5.5 measured
SAGE (Vals AI)51.8%38.1%Claude Sonnet 5.5
MedScribe (Vals AI)91.1%77.1%Claude Sonnet 5.5
Vals Multimodal IndexNot measured47.6%Only GPT-5.4 Nano measured
IFBenchNot measured75.9%Only GPT-5.4 Nano measured
Long context reasoning (AA-LCR)82.7%76.7%Claude Sonnet 5.5
DTBench97.3%80.3%Claude Sonnet 5.5
LMCA68.3%36.9%Claude Sonnet 5.5
Furniture assembly75.0%Not measuredOnly Claude Sonnet 5.5 measured
LMArena Text14731372Claude Sonnet 5.5
LMArena Text: instruction following14911362Claude Sonnet 5.5
LMArena Text: creative writing14681314Claude Sonnet 5.5
LMArena Vision12871196Claude Sonnet 5.5
LMArena Text: English14861381Claude Sonnet 5.5
LMArena Text: non-English14561360Claude Sonnet 5.5
LMArena Text: Chinese15351391Claude Sonnet 5.5
LMArena Text: GermanNot measured1368Only GPT-5.4 Nano measured
LMArena Text: Japanese14601343Claude Sonnet 5.5
LMArena Text: KoreanNot measured1320Only GPT-5.4 Nano measured
LMArena Text: French14951395Claude Sonnet 5.5
LMArena Text: Spanish14461371Claude Sonnet 5.5
LMArena Text: Russian14581362Claude Sonnet 5.5
LMArena Text: PolishNot measured1366Only GPT-5.4 Nano measured
LMArena Text: multi-turn14651382Claude Sonnet 5.5
LMArena Text: longer queries14951366Claude Sonnet 5.5
LMArena Text: writing and language14761338Claude Sonnet 5.5
LMArena Text: entertainment and media14621324Claude Sonnet 5.5
LMArena Vision: English12891202Claude Sonnet 5.5
LMArena Vision: ChineseNot measured1232Only GPT-5.4 Nano measured
LMArena Vision: reading text12971204Claude Sonnet 5.5
LMArena Vision: humorNot measured1161Only GPT-5.4 Nano measured
LMArena Vision: recognizing thingsNot measured1141Only GPT-5.4 Nano measured
LMArena Vision: creative writing12421159Claude Sonnet 5.5
Neither model has a result on the other 13 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Claude Sonnet 5.5 and GPT-5.4 Nano
BenchmarkClaude Sonnet 5.5GPT-5.4 NanoLeader
Neither model has a result on 5 boards here

What each workload costs

Three fixed token mixes at each model's listed price, so per-token rates become a bill.

Chat turn

1K input + 500 output tokens

Claude Sonnet 5.5$0.0070Fits in one request
GPT-5.4 Nano$0.0008Fits in one request

GPT-5.4 Nano costs less

Repository review

50K input + 3K output tokens

Claude Sonnet 5.5$0.130Fits in one request
GPT-5.4 Nano$0.014Fits in one request

GPT-5.4 Nano costs less

Agent loop

200K input + 10K output tokens

Claude Sonnet 5.5$0.500Fits in one request
GPT-5.4 Nano$0.052Fits in one request

GPT-5.4 Nano costs less

Listed OpenRouter rates, without cache or batch discounts. A workload that does not fit a model's context window would need splitting.

Specification differences

The leading value in a row is marked; a row with a missing value names no leader. Our two rows are marked in red.

Specifications of Claude Sonnet 5.5 and GPT-5.4 Nano
SpecificationAnthropic Claude Sonnet 5.5OpenAI GPT-5.4 Nano
MakerAnthropicOpenAI
WeightsNo public weights listedNo public weights listed
ReleasedSeptember 28, 2026March 17, 2026
Context window1M400K
Input $/Mtok$2.00$0.20
Output $/Mtok$10.00$1.25
Coding index87.344.8
Independent measurements behind it52
Cost per solved taskNot computable$0.14
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Sonnet 5.5 better than GPT-5.4 Nano for coding?

Pick Claude Sonnet 5.5 for coding: it scores 87.3 on the Vibe Coding Index against 44.8 for GPT-5.4 Nano. Pick GPT-5.4 Nano for output tokens 8.0x cheaper ($1.25 vs $10.00 per million).

Which is cheaper, Claude Sonnet 5.5 or GPT-5.4 Nano?

Claude Sonnet 5.5 costs $2.00 per million input tokens and $10.00 per million output tokens; GPT-5.4 Nano costs $0.20 and $1.25. Cost per solved task is known for GPT-5.4 Nano only.

Which has the bigger context window, Claude Sonnet 5.5 or GPT-5.4 Nano?

Claude Sonnet 5.5, with 1M tokens against 400K.

How many benchmarks is the Claude Sonnet 5.5 vs GPT-5.4 Nano comparison based on?

57 benchmarks have a result for both models as of October 23, 2026. Claude Sonnet 5.5's coding index rests on 5 independent benchmarks and GPT-5.4 Nano's on 2. Where only one model has a result, the page says so instead of naming a winner.

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